<template>
  <nav class="clearfix">
    <ul class="pagination">
      <li :class="{'disabled': current == 1}"><a href="javascript:;" @click="setCurrent(current - 1)"> <i class="icon-left"></i> </a></li>
      <li :class="{'disabled': current == 1}" class="homePageBtn"><a href="javascript:;" @click="setCurrent(1)"> {{$t('pagination.first')}} </a></li>
      <li v-for="(p, i) in grouplist" :class="{'active': current == p.val}" :key="i"><a href="javascript:;"
                                                                          @click="setCurrent(p.val)"> {{ p.text }} </a>
      </li>
      <li :class="{'disabled': current == page}" class="lastPageBtn"><a href="javascript:;" @click="setCurrent(page)"> {{$t('pagination.last')}} </a></li>
      <li :class="{'disabled': current == page}"><a href="javascript:;" @click="setCurrent(current + 1)"> <i class="icon-right"></i> </a></li>
      <li v-if="page > 10" class="go-page">
        {{$t('pagination.go')}}
        <input class="go-input" v-model="pages" @keyup.enter="setCurrent(pages)" type="number" />
        {{$t('pagination.page')}}
        <button @click="setCurrent(pages)">{{$t('pagination.confirm')}}</button>
      </li>
    </ul>
  </nav>
</template>

<script type="es6">
  export default{
    data() {
      return {
        // current: this.currentPage
        pages: null
      }
    },
    props: {
      total: {// 数据总条数
        type: Number,
        default: 0
      },
      display: {// 每页显示条数
        type: Number,
        default: 10
      },
      currentPage: {// 当前页码
        type: Number,
        default: 1
      },
      pagegroup: {// 分页条数
        type: Number,
        default: 5,
        coerce: function (v) {
          v = v > 0 ? v : 5;
          return v % 2 === 1 ? v : v + 1;
        }
      }
    },
    computed: {
      current () {
        return this.currentPage
      },
      page: function () { // 总页数
        return Math.ceil(this.total / this.display);
      },
      grouplist: function () { // 获取分页页码
        var len = this.page, temp = [], list = [], count = Math.floor(this.pagegroup / 2), center = this.current;
        if (len <= this.pagegroup) {
          while (len--) {
            temp.push({text: this.page - len, val: this.page - len});
          }
          ;
          return temp;
        }
        while (len--) {
          temp.push(this.page - len);
        }
        ;
        var idx = temp.indexOf(center);
        (idx < count) && ( center = center + count - idx);
        (this.current > this.page - count) && ( center = this.page - count);
        temp = temp.splice(center - count - 1, this.pagegroup);
        do {
          var t = temp.shift();
          list.push({
            text: t,
            val: t
          });
        } while (temp.length);
        if (this.page > this.pagegroup) {
          (this.current > count + 1) && list.unshift({text: '...', val: list[0].val - 1});
          (this.current < this.page - count) && list.push({text: '...', val: list[list.length - 1].val + 1});
        }
        return list;
      }
    },
    methods: {
      setCurrent: function (num) {
        let idx = parseFloat(num)
        if (this.current != idx && idx > 0 && idx < this.page + 1) {
          this.$emit('pagechange', idx);
          this.pages = null
        }
      }
    }
  }
</script>
